A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a building includes a monitoring device installed at the building, a monitoring server located remotely from the building, and a review server. The monitoring device measures an aggregate current supplied to components of the HVAC system and transmits current data based on the measured aggregate current. The monitoring server receives the transmitted current data and, based on the received current data, assesses whether failures have occurred in first and second components of the HVAC components. The monitoring server generates a first advisory in response to determining that the failure has occurred in the first component. The review server provides the first advisory to a technician for review and, in response to the technician verifying that the failure has occurred, transmits a first alert.

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Hvac system remote monitoring and diagnosis

A monitoring system for a heating, ventilation, and air conditioning (HVAC) system of a residence includes a monitoring device installed at the residence and a server located remotely from the residence. The monitoring device measures an aggregate current supplied to a plurality of components of the HVAC system and transmits current data based on the measured aggregate current. The server receives the transmitted current data and, based on the received current, assesses whether a failure has occurred in a first component of the plurality of components of the HVAC system and assesses whether a failure has occurred in a second component of the plurality of components of the HVAC system.

Residential solutions hvac monitoring and diagnosis

A heat pump cycle includes a compressor having a suction port and a discharge port, a heating heat exchanger which heats air, a gas-liquid separator, and a cooling heat exchanger which cools air upstream of the heating heat exchanger in an air flow direction. The heat pump cycle further includes an intermediate pressure passage which guides gas refrigerant from the gas-liquid separator to the suction port. A variable open-close portion opens the intermediate pressure passage and decompresses the gas refrigerant in the intermediate pressure passage, so that the gas refrigerant is introduced into the suction port when a bypass dehumidifying-heating mode is selected as a dehumidifying-heating mode in which the air having been heated in the heating heat exchanger becomes equal to or higher than air in an air-conditioning target space in temperature.

Heat pump cycle

An efficient thermal management system (100) that utilizes a single heat exchanger (133) is provided. A refrigeration subsystem (103) cools the heat exchanger (133). A first coolant loop (139) in thermal communication with the heat exchanger (133) is used to cool the energy storage system (137). A second coolant loop (151) corresponding to the HVAC subsystem (107) is also in thermal communication with the heat exchanger (133). Preferably a third coolant loop (109) corresponding to the drive motor cooling subsystem (101) is coupleable to the HVAC coolant loop (151), thus providing an efficient means of providing heat to the HVAC subsystem (107).

Electric vehicle thermal management system

A dual mode, thermal management system for use in a vehicle is provided. At a minimum, the system includes a first coolant loop in thermal communication with a battery system, a second coolant loop in thermal communication with at least one drive train component (e.g., electric motor, power electronics, inverter), and a dual mode valve system that provides means for selecting between a first mode where the two coolant loops operate in parallel, and a second mode where the two coolant loops operate in series.

Thermal management system with dual mode coolant loops

An air conditioner for an economically running vehicle includes a compressor driven by a vehicle engine, an evaporator, and a cold-storage heat exchanger having a cold storage material. The evaporator and the cold-storage heat exchanger are disposed in series in a refrigerant flow. When the compressor is operated, the cold storage material is cooled by low-pressure refrigerant in a cold storage mode. When the operation of the compressor is stopped, refrigerant circulates between the evaporator and the cold-storage heat exchanger, so that refrigerant evaporated in the evaporator is cooled and liquefied by the cold storage material in a cold release mode. Further, a flow direction of refrigerant flowing through the evaporator in the cold storage mode is the same as that in the cold release mode.

Vehicle air conditioner with cold storage unit

A vapor compression type refrigeration apparatus is provided, in which refrigerant leakage is detected at an early stage. A temperature difference related to the theoretical heat dissipation of the condenser is compared with the actual temperature difference in heat dissipation (temperature difference between the condensation temperature and the outside-air temperature) of the condenser to determine whether there is a refrigerant leak.

Vapor compression type refrigeration apparatus including leak detection and method for detecting refrigerant leaks

There are provided a water-refrigerant heat exchanger 30 for exchanging heat between refrigerant discharged from a compressor 21 and engine-cooling water circulating an engine-cooling water circuit 10, prior to being fed into the radiator 22, and a bypass 25 for guiding the refrigerant prior to being fed into the evaporator 24 to the water-coolant heat exchanger 30 while bypassing the evaporator 24 and the compressor 21. When it is desired to accelerate the warming-up of the engine 11, the bypass 25 is closed to operate the compressor 21 to heat the engine-cooling water by high-pressure refrigerant, and when it is desired to complement the capacity of the radiator 12, the bypass 25 is open to guide the liquid-phase refrigerant to the water-refrigerant heat exchanger 30 to effectively cool the refrigerant by using the phase change of the refrigerant.

Heat control system

In a heat storage system for a vehicle, when a temperature of cooling water from a vehicle engine is high, adsorbents are heated by the cooling water, so that moisture is desorbed from the adsorbents in order to store heat. When the temperature of cooling water is low, the moisture is adsorbed in the adsorbents to heat the cooling water, while refrigerant in a vapor compression refrigerator is cooled by evaporating water. Thus, adsorption heat is generated from the adsorbents, and the cooling water is heated by using the adsorption heat. Accordingly, warm-up operation of the vehicle engine is facilitated, while motive power consumed by the vapor compression refrigerator can be reduced.

Heat storage system for vehicle, with adsorbent

PROBLEM TO BE SOLVED: To allow for heating by effectively using heat drawn from cooling on-vehicle heating parts in winter, and to allow for cooling on-vehicle heating parts in summer. SOLUTION: A water coolant heat exchanger 31 is provided on the discharge side of a compressor 21 of a refrigerating cycle 20 for heating cooling water by using gas coolant discharged from the compressor. A condenser 25 is provided to cool an on-vehicle heat producing component 25a by using coolant of an intermediate cycle pressure. An air-conditioning duct 2 is provided with an evaporator 23 and a hot water heater core 43. A cooling water circuit 40 is provided with an engine 41, a radiator 42, and an electric pump 44, in addition to the water coolant heat exchanger 31 and the hot water heater core 43. Heat resulting from cooling the on-vehicle heat producing component 25a pumped up by the compressor 21 is radiated to cooling water, thereby cooling can be performed from the heat producing components when the outside temperature is high.

Takahisa Suzuki

Papers

Vehicle air conditioner with cold storage unit

Vapor compression type refrigeration apparatus including leak detection and method for detecting refrigerant leaks

Heat control system

Heat storage system for vehicle, with adsorbent

Vehicle air conditioner